Combined flue and water tube steam-generator.



No. 761,700. I PATENTEDUJUNE 7,1904.

T. NIELSEN & G. 0. H. PREST. COMBINED FLUE AND WATER TUBE STEAMGE.NERATOR-.-=

APPLICATION FILED FEB. 4, 1903.

NO MODEL.

vIO

UNITED STATES iatented June '7, 1904.

PATENT OFFICE.

THOMAS NIELSEN AND GOTTFRED CARL HENRIK PRZEST, OF NORDBY,

. DENMARK.

COMBINED FLUE AND WATER TUBE STEAM-GENERATOR- SPEGIFICATION'forming partof Lettersrlatent No. 761,700, dated June 7, 1904:. Application filedFebruary 4, 1903. Serial No. 141,891. (No model.)

To all whom it may concern:

Be it known that we, THOMAS NIELSEN and Go'rrFRED CARL 'HENRIK PREST,subjects of the King of Denmark, residing at Nordby, Fano, Denmark, haveinvented certain new and useful Improvements inv a Combined Flue andWater Tube Steam-Generator, "of which the following is a specification.

The present invention relates to improvements in the arrangement of andConnection between the water and flue tubes, through which improvementsis obtained an essential security in respect to tensions in thefluetubes by unequal heating ofsaid tubes and to too great a heating atthe ends of the tubefittings, at the same time as facility fordisinounting for the purpose of cleaning or the ike.

An embodiment of the invention is shown,

and described with reference to the accom-' panying drawings.

Figure 1 shows a broken front or end view of a water vessel, and Fig. 2ahorizontal sec-' tional view on the line E Fin Fig. 1.

The system of tubes comprises a plurality of water vessels cl d of theknown kind with corrugated side surfaces. d is the foremost vessel, andd the hindmost, which is adjacent to the combustion -chamber. Thesewater vessels are-connected by water-tubes e, and through each alinedset of water-tubes ethere passes a flue-tube c. Alined with thewatertubes there are in the outer wall of the water vessel cl openingsfor cleaning, each of said openings being closed, with a piped fixed inthe water vessel cl and provided with a thinner expanded wall, to whichpart of the pipe 2 the expansion of the corresponding flue-tube c istransferred. Each pipe c has near its outer end a conical seating i, inwhich fits a corresponding externally-conical ring a on the end of theflue-tube c, and said ring a is firmly fastened in the seating e" bymeans'of a ut 9, screwed interiorly into the end of the pipe z'. On theother end of the flue-tube c is arranged another conical ring 6, whichhas on its inner or basic end a recessed cavity or and fits in'acorresponding conical seating .7) in the outer wall of the water vesseld, to which it is fastened by means of a nut f, which abuts upon theoutside of said vessel and is screwed upon the ring 5. By tightening thenuts f and g the fluetubes are fastened in the water vessels, and theexpansions in said tubes'when they are heated aretransferred to thethinner expansible parts of the pipes i, which gives a partial or localelasticity to the whole system of tubes. The ring 6 has itslargestdiameter a little smaller than the smallest diameter of theseating 6, so that by unscrewing the nuts f and g the flue-tubes 0 maybe taken out of the corresponding water-tubes without taking out thepipes 21. Dismounting and cleaning of the tubes are made easier, and thepipes; may be very firmly secured to the water vessel (Z. By thedescribed arrangement of the flue-tubes it also will be seen that anessential security against too great a heating of the ends of said tubesis provided, since'the water may circulate in the interior part of eachring 6 and will thus lead away the heat from the outermost end of thetube cand the ring 5. At the same time the conical part of each ring aand also the nut g are so far removed from the outlet of the products ofcombustion that excessive heating of the said parts is avoided and tightjoints are preserved.

We claim 1. In a tubulous boiler,-thecombination of a system of watervessels, water-tubes connecting them, and flue-tubes traversing saidwater-tubes, one extreme water vessel having in its exterior wallconical seatings, pipes closing the openings for cleaning in theexterior wall of the other extreme water vessel, each of said pipesbeing'provided with a thinner expanded wall and having a conical seatingnear its outer end, conical rings on the ends of the flue-tubes toengage said conical seatings, and nuts for forcing said rings on theirseatings for the purpose set forth.

2. In a tubulous boiler. the combination of a system of water vessels,water-tubes consaidpipes being provided With a thinner ex- In witnesswhereof \vehm'e hereunto set our pended Wall and having a conicalseating near hands in presence of two witnesses.

1 U its outel end, conical r n s on the ends of the THOMAS NIELSENflue-tubes to engage said conical seatlngs, and

I 5 nuts for forcing said rings on their seatings, GOTTFRED CARL HENRLKPRES, said rings being each provlded With an inte- \Vitnesses:

rior cavity in Which Water may eirenlete for J ORGE MONINOKEL,

the purpose set forth. 0. GONSALER.

